Thirty Charged in Decade-Long Insider Trading Scheme at Major Law Firms

Federal prosecutors unsealed charges against 30 defendants in Boston on May 6 2026. The indictment alleges participation in a decade-long insider trading scheme that produced tens of millions of dollars in illicit profits from information on nearly 30 merger and acquisition deals.

The defendants worked as corporate attorneys and financial professionals. They stole confidential information from several premier law firms. One of those firms is headquartered in Massachusetts. The scheme allowed them to trade securities with an advantage derived from nonpublic deal terms.

Profits from the trades accumulated over the ten-year period to reach the tens of millions figure cited in the release.

The prior state involved the continued operation of the trading ring without charges. The new state begins the public phase of the criminal process in the U.S. District Court for the District of Massachusetts. The change took effect with the unsealing of the documents on May 6.

The U.S. Attorney's Office will now manage the prosecution of all 30 cases. This includes presenting evidence of how the information was taken and how the trades were executed. The court will set timelines for hearings and potential trials. Defendants who are convicted face the possibility of sentences that include incarceration and financial penalties tied to the profits.

This case forms part of the Justice Department's ongoing work in securities enforcement. The agency has filed similar charges in other matters involving the misuse of confidential business information obtained through professional roles. The current action covers a large number of deals and defendants compared to many individual prosecutions.

The details in the charging papers identify the law firms involved only in general terms except for the Massachusetts headquarters reference. No specific deal names appear in the public summary of the allegations. The focus remains on the methods used to extract and monetize the data over the extended period.

The global aspect of the scheme refers to the reach of the trading activity rather than the location of the defendants. All charges were brought in the Massachusetts district because of the connection to the law firm there and the venue of the investigation.

The case will proceed under federal criminal statutes that address securities fraud and conspiracy.